Apparatus for sharpening drills or drill-bits.



W. E. KIMBER. APPARATUS FOR SHARPENING DRILLS 0B. DRILL BITS.

` APPLICATION FILED JULY 10,1906.

` Patentea'oct. 27, 1908.

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W. E. KIMBBR. APPARATUS FR SHARPENING DRILLS 0B. DRILL BITS.

APPLICATION FILED JULY 10,1908.

Patented 0011.27, 1908.

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THK NoRRrs PErERs co., wAsmNcroN, u. c.

W.- E. KIMBER. y ABPARATUS-FOB. SHARPENING DRILLS 0R DRILL BITS. I

APPLIOATION FILED JULY'lO, 1906.

902,416, Patented 0ct.27, 1908.

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UNXTED STATES FATET FFICE.

WALTER EDWARD KIMBER, OF JOHANNESBURG,ITRANSVAAL.

APPARATUS FOR SHABPENIN G DRILLS OR DRLL-BITS.

To all whom it may concern:

Be it known that I, l/VALTER EDWARD Kremlin, a subject of the King of Great Britain, and resident of Johannesburg, Transvaal, have invented certain new and useful Improvements in Apparatus for Sharpening Drills or Drill-Bits7 of which the following is a specification.

This invention relates to machines or apparatus tor sharpening drills or drill bits employed for drilling holes in rock in mining and other similar work.

lt. is designed to construct a machine in or by means et which the drills or hits may be sharpened in a more etlicient and expeditious manner than at present, thereby enabling the sharpening to be effected with less labor and consequently at less expense.

In the accompanying drawings forming part of this specication 1 illustrate a prac tical embodiment of the invention adapted tor the sharpening of the crucit'orni drill or bit commonly known as a star bit in the drawings, Figure 1 represents the machine in longitudinal part sectional elevation, Fig. Q is an end elevation of the same, liig. 3 is a front elevation, partly in section, ot the two sets et tools which operate longitudinally on the wings of the drill or bit to forge and size the same, and the means `t'or actuating said tools. Fig. i is a detail view of portion of the periphery of the disk il, illustra ving the guideway S tor one of the tools, the recess in said guideway for the spring, and the spring which operates to maintain the tool in its expanded or outer position. Fig. 5 is a transverse section of the table (the plane ot section being indicated on the line mwen ot Fig. 1) illustrating` the movable and adjustable stop tor the shank end of the drill or bit. Fig. 6 is a plan of the self-centering vise, and Fig. 7 is a front elevation of the dolly.

In Figs. 1 and 2, 1 designates a foundation or bed plate, which serves for carrying the several parts of the machine at a convenient height. The bedplate 17 in proximity to one end thereof, is constructed with or has bolted or otherwise conveniently fixed to it7 a vertical frame or support 2. This trame 2 is constructed with a cylindrical or other suitably shaped hole 3 in its upper portion. The frame 2 serves for carrying the forging tools or the tools for shaping the drill or bit or operating between the wings for imparting to it the cruciform section, and the tools Speccation of Letters Patent.

Application :led July 10, 1906.

Patented Oct. 27, 1903.

Serial No. 325,489.

for sizing the drill or bit, for rounding the wings and tapering the wings longitudinally or for putting the proper clearance on the sides of the wings. For performing these operations two sets of tools are employed and they are operatively carried by means of a stationary disk 4. The disk 4l is constructed with a hollow cylindrical projection 5 at the back, and the outer end of the cylindrical projection 5 is formed with an inwardly directed flange (3 which serves for bolting said disk to itsvertical support 2. rThe tlange 6 Jforms a central aperture coinciding with the aperture 3 in the vertical support 2. The disk Ll is constructed with a central. hole 7 and with eight radial slots 8, which form guideways for the two sets of forging tools. The several tools are retained in position in their guideways 8 by means ot a ring 8 tixed by means of bolts 3b to the disk 1.

The tools marked 9 are the shaping tools or those which operate between the radial wings 10 of the cruciform drill steel to im.- part to it the requisite symmetrical crucii'orm section. The other set of four tools 11 are the tools which operate to put the requisite clearance or taper longitudinally of and in the direction of the shank 1Q on the sides or outer edges of the wings 10 ot' the drill,

may be used for forging the cruciiorm or star section out of the ordina-ry octagonal or other suitable section ot' drill steel.

rhe inner extremities of the four tools 9 are of L shape to operate between the wings while the other four tools 11 are rounded and inclined longitudinally to form the taper and impart the rotundity to the sides of the wings 1,0. Each of the tools 9, 11, has fixed to it a pin 13 which traverses a radial slot 14 formed through the front ring 8a. This pin 13 and slot 14 serve for limiting the outward movement of the several tools 9, 11. The several tools 9, 11, are also constructed at their outer ends with a projection 15 and in the guideways 3 at one side, is formed a recess 16. In this recess 16 and resting at one end in the bottom of the recess and at the other end engaging the projection 15, is a spiral spring 17 which serves for maintaining the tool in its expanded or outermost position or with the pin 13 engaging the outer end of the slot 14.

projection o rilhe outer ends of the several tools 9, 11, project slightly beyond the circumference of the disk 4, as shown more particularly 4in Fig. 3, and they are curved or inclined as indicated at a from the one edge to the other.

Round the disk 4 is arranged an oscillating ring consisting of two ainnulai1 o1 approximately annular pieces 18 connected by the four circumferential or peripheral webs 19. The oscillating ring is constructed with a cylindrical projection 20, the internal diameter of which approximately corresponds to the external diameter of the cylindrical projection on the disk 4f, whichcylindrical constitutes a bearing for said oscillating ring 18. ln the oscillating` ring 18 are arranged four rollers which are revolubly mounted on four pins 22 fixed between the two annular parts 18 of said ring.

\ The diameter' of these rollers 21 is such that they are adapted, when the ring is oscil lated, to simultaneously engage the curved outer extremities of either set of tools 9, 11, and to alternately move each set inwards in their guideways 8 so that their inner ends operate to forge the bit when it is placed in position. When the ring 18 is moved in one direction it simultaneously actuates the four tools 9, and when moved in the reverse direction it in like manner simultaneously operates the other four tools 11. lVhen the tools 9, 11 are alternately operated as described, the springs 17 are placed in compression so that they operate when the rollers 21 disengage the outer ends of the tools 9, 11, to expand them or force them in an outward direction. The portions la of the circumference of the disk si, permit the rollers 21 to revolve freely after disengaging the one set of tools and before engaging the other set. By the means described it will be evident that by oscillating the ring 18 or i'noving it thiiough portion of a revolution first in one direction and then in the other direction and then bringingl it into a central position or midway between the tools 9, 11, or with the rollers 21 engaging the portions 4a of the circumference of the disk., in which position it is shown in Fig. 3,) first one set of tools is actuated to operate ou the drill or bit, then the other set, and then when the rollers take up the position shown in Fig. 3, all the tools are permitted to expand or stand apart clear of the drill or bit e. This mode of actuating the forging and swaging tools 9, 11, constitutes an extremely important feature of the present invention, as by having all the swaging and forging tools clear of the drill or bit when the dolly is brought into operation, permits of the proper operation of said dolly.

On the back of the oscillating ring 18 formed a projection 22a and on the vertical part of the frame 2 are formed two projections d8 through which are formed holes in the other ends of the holesare screwed adjusting screws 25 and between the inner endsI of the adjusting screws 25 and the inner ends of the stops 24 are placed spring-buffers 26. The outer extremities of the adjustable resilient stops :24 are adapted to be engaged by the projection 22 on the oscillating ring 18 and by their position to determine the extent of the oscillatory movement transmitted to said ring 18, and by that means determine the movement transmitted to the forging and swaging tools 9, 11. Then the movement of said oscillating ring is limited, it reduces the movement of the tools 9, 11. rl`his permits of any desired adjustment of the tools 9, 11 being effected to operate on varying sizes of drills or bits, and obviates all necessity for substituting or changing the tools to sharpen drills of varying size.

For the purpose of oscillating the ring to actuate the forging and swaging tools 9, 11, an oscillatii'ig cylinder 27 is mounted on the hedplate 1 of the machine-see Fig. 2. The piston rod Q8 working in this cylinder 2T is attached, as indicated at 29, to the oscillating ring 18. Means, such as are employed in a steam hammer are provided for controlling the admission of the actuating fluid to the oscillating cylinder 2T to vary the force with which. the forging tools and swages operate on the drill or bit. A bracket 30 is shown fixed to the frame 2, to which bracket 80 is pivoted a bell-crank lever 31, to one arm of which is fixed a handle 32 and to the other arm the valve rod 38. By means of said handle 39 bellcrank 81 and valve rod 83, the movement of the valve is controlled by the operator to admit the actuating fluid to the cylinder 2i' to actuate the oscillating ring 18.

At the rear of the vertical frame 2 and formed upon or fixed to the bedplate 1, is a standard 34 which serves for carrying the hammer which actuates the dolly. 35 is the cylinder' of the hammer and 8G the striker. The forward portion 37 of the hammer cylinder serves as guide for the dolly. 88 is the dolly (shown in front elevation Vin Fig. 7) constructed with a shank 39 which projects into the bore of the forward en d of the hammer cylinder The inner end of the shank 39 reduced and on its` inner end it receives the impacts of the striker' 86. he forward end of the hammer cylinder 35 is shown constructed with a recess 40. ln this recess 40 and bearing against the back of the dolly 38 is a spring 41 which keeps the dolly 38 in position on the end of the drill. while it is being struck. The dolly 38, which serves to upset the drill or hit, is formed with l! grooves 49, see Fig. 7, which intersect-at the center and operate to form the cutting edges along the radial ends of the wings 10 of the drill. To the dolly 38 is attached a hook 43 which is connected to a rod 44. The rod 44 is pivotally attached at its other extremity to a lever 45, which latter is pivoted to a lug 46 formed on the standard This lever 45 works in a quadrant 47 and is fitted with a trigger 48 which is adapted to engage a notch or recess 49 in the quadrant 47. The lever is provided for retracting the dolly 38 while the drill is being operated upon by the forging tools and swages, the trigger 48 serving to maintain the lever 45 and dolly 38 in this position. Then the lever 45 is released by disengaging the trigger 48, the spring 4l moves the dolly 38 into contact with the face of the drill. The actuating fluid is then admitted to the hammer cylinder to aetuate the striker 36.

t will be evident that by the above described arrai'igement of dolly 38 and forging tools and swages, the drill is operated upon from the end and from all sides without turning the drill over or moving it in any way.

(ln the bedplate l at the front of the frame are provided supports 50, 5l for a table, shown consisting of a pair of parallel beams which between them form a guideway for a moable and adjustable stop. rThe stop which serves to engage and support the shank or rear end of the drill while it is being operated upon by the forging tools, swages, and dolly, is shown consisting of a carriage or cylindrical casting 53 mounted on wheels 54, which are adapted to traverse the upper edges of the parallel beams or girders 52, see Fig. 5. rilhis carriage 53 is cast or otherwise constructed in one piece with a part 55 which traverses longitudinally of and between the beams 52, which form a guide for it. This part is constructed with a horizontal hole 5G and with a vertical. recess 57 on the underside. Fitting this vertical recess 57 is a half nut 58 which at its outer end is pivotally connected to a lever which latter is pivotally connected to a lng 8O on the part 55, the lug forming the fulcrnm of said lever 59. The lever is turned in an upward direction projecting between the beams to the top of the table, where it is fashioned into a handle G1. G2 is a weight xed to the lever 59 which serves for keeping the lever depressed and maintaining the half nut 58 in engagement with its actuating screw 63. The screw 63, which is journaled in bearings G4 provided for it between the parallel beams 52, is arranged horizontally and projects through the horizontal hole 56 in the part The half nut 58 engages the thread of the screw 63 so that the latter when rotated serves for advancing or receding the stop according to the length of the drill or bit to be operated upon. 65 is a recess formed in the front of the stop 53 to receive the shank end of the drill and 66 a handle for moving the stop 53 longitudinally of the table in either direction. For the purpose of rotating the screw 63 to move the stop 53 in either direction to finally adjust the stop l provide a handwheel 87 which is fixed on a spindle 68 supported by one of the beams 52, which spindle 68 on the inside of the beam 52 has lixed to it a bevel wheel 69 which gears with a bevel wheel 70 keyed or otherwise suitably fixed to the screw 63.

ln front of and in close proximity to the forging tools and swages 9, ll, l provide a self-centering vise for holding and steadying the drill near to the cutting end in order to prevent the bending` of the drill or bit and to hold it steady while the dolly 38 is in operation. rThis vise holds the drill or bit laterally while the adjustable back stop 53 holds it longitudinally, thus the drill is kept in exact position between the tools when being forged. rlhis vise is shown in Figs. l and G. lt consists of a plate 7l bolted or otherwise suitably fixed to the forward end of the table 52, which plate 7l is constructed to form guides 72 for two nuts 73, the one constructed with a right hand threaded hole and the other with a left hand threaded hole. 74 is a spindle formed with corresponding right and left hand threads engaging said nuts 73. On one end of this spindle 74 is fixed a spur wheel 75 which is engaged b v another spur wheel 7G operated by a handwheel 77. T he spindle 78 to which the handwheel 77 and spur wheel 75 are iixed is carried by a lug 7 9 formed on one of the guides 72. The two nuts 73 are constructed with vertical cylindrical projections 80 on which are mounted the halves 8l of the jaw of the vise, which halves 8l are grooved horizontally to receive the horizontal wings l0 of the drill when in position therein. By rotating the handwheel 77 in one direction the jaws 8l of the vise grip the drill and center it for the forging tools, swages and dolly.

Means are provided for lubricating the forging tools and swages, for removing the scales from between the same, and for keeping the tools cool. These as shown comprise a ring 82, which is lixed to the back of the disk 4 inside the hollow cylindrical projection Between this ring 82 and the disk 4 is formed an annular groove 83. 84 is a pipe communicating with a T piece, one branch 85 of which is connected Cgi with a source of supply of compressed air,

another branch 86 being connected with an oil cup 87. 88 is a cock on the pipe 84 between the cup 87 and T piece for regulating the quantity of lubricant which is permitted to pass from the cup 87 into the T piece. In the disk 4 are formed eight holes 89, one for each tool. These holes 89 communicate with grooves 90 formed in the guideways 8, see F ig. 3, at the back of the tool. These latter grooves 90 communicate with grooves 91 formed in the sides of the guideways 8 and with another groove 92 formed in the front plate 8a. A small supply of compressed air is pre'ferably kept on when the machine is in operation and this jet of air serves to carry with it the lubricant into the grooves 90, 91, 92,l in the disk 4 and plate 8a surrounding the several tools. rIhe compressed air escapes from between the tools, disk 4t and ring S2 towards the inner ends of the tools and so blows out any scale from the joints between the wearing surfaces, serving atthe same time to keep the tools cool and to introduce the lubricant.

The means hereinbefore described and shown in the accompanying drawings for bringing up the corners of the drills or drill bits constitute the subject matter of an application Serial No. 354,629, filed J an. 29, 1907, as a division of my present case.

lVhat l claim as my invention and desire lto protect by Letters Patent is c- 1. In apparatus for sharpening rock-drills or bits, incombination, a plate constructed with a central aperture and a plurality of radial guideways, a plurality of forging and swaging tools arranged alternately in said guideways, a frame supporting the plate, yielding and adjustable stops carried by said frame, an oscillatory ring surrounding the plate and carrying means to actuate the tools, and a projection on the oscillating ring which is adapted to engage the adjustable resilient stops to regulate the stroke of the tools, as set forth.

2. In apparatus for sharpening rock-drills or bits, in combination, a disk provided with a plurality of radial guideways, a plurality of forging and swaging tools arranged alternately in said guideways, said disk being constructed with a plurality of holes, one for each guideway, grooves formed between the guideways and the tools on all sides and communicating with said holes, a ring fixed to the disk, said ring being constructed with an annular groove communicating with all of the aforesaid holes in the disk, and means for supplying lubricant and fluid under pressure to the annular groove in the ring.

3. In apparatus for sharpening rock-drills or bits, in combination, a disk provided with a plurality of radial guideways, a plurality of forging and swaging tools arranged alter'- nately in said guideways, said disk being constructed with a plurality of holes, one for each guideway, grooves formed between the guideways and the tools on all sides and communicating with said holes, a ring fixed to the disk, said ring being constructed with an annular groove communicating with all of the aforesaid holes in the disk, a pipe communicating with the annular groove in the ring, a compressed fluid supply connected with said pipe, and a lubricant supply also connected with said pipe.

et. ln apparatus for sharpening rock-drills or bits, in combination, a disk constructed with a central aperture and with a plurality of radial guideways, a plurality of forging and swaging tools arranged alternately in said guideways, means for actuating said tools, means for holding a drill or bit in said central aperture, a dolly adapted to operate on the end of a drill or bit when held in said central aperture in the disk, means for retracting the dolly to maintain it clear of the face of the drill when the forging and swaging tools are in operation, and means for disengaging said retracting means to maintain the dolly in contact with the end of the drill when the dolly is in operation.

In apparatus for sharpening rock-drills or bits, in combination, a disk constructed with a central aperture and with a plurality of radial guideways, a plurality of forging and swaging tools arranged Aalternately in said guideways, means for actuating said tools, means for holding a drill or bit in said central aperture, a dolly adapted to operate on the end of a drill or bit when held in said central aperture in the disk, a cylinder, a hammer piston therein adapted to strike the dolly, a spring engaging the dolly, means for reti-acting the dolly and placing said spring iii compression, and means .for locking the dolly in its retracted position, which locking means when released permit the spring to force the striking face of the dolly into contact with the end of the drill or bit in the aperture in the disk while the dolly is being struck by the hammer piston.

In witness whereof l have hereunto set my hand in the presence of two subscribing witnesses.

VALTER EDVARD KIMBER.

Tit nesses Ci-ias. Ovnnnaiiii, R. OvnNDaLn. 

